How long should oil buffers take to return to their fully extended position after being released?

Oil buffers are critical components in elevator systems, designed to absorb the impact when the elevator car reaches the end of its travel. The specified time for these buffers to return to their fully extended position is indicative of their performance and operational safety.

The standard time for oil buffers to return to their fully extended position after being compressed is typically 90 seconds. This duration allows for the controlled retraction of the buffer to ensure smooth operation and prevent mechanical failure. It also accounts for the viscosity of the oil used in the buffers, ensuring it has adequate time to flow back into the buffer chamber and return to a ready state for the next impact scenario.

In contrast, shorter or longer durations could suggest malfunctioning components or improper conditions that could compromise the safety and reliability of the elevator system. Therefore, the 90-second requirement aligns with safety standards and operational guidelines vital for the effective functioning of elevators.